PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Lagostomus (Lagostomopsis) incisus

Mammalia - Rodentia - Chinchillidae

Taxonomy

Lagostomus incisus was named by Ameghino (1888) [The holotypes of Lagostomus (Lagostomopsis) incisus and “L. (L.) spicatus” were originally deposited at the MLP (Ameghino 1889), but both are currently lost. We therefore propose MACN−A1112 as the neotype, because it was referred by Ameghino (1889: pl. 9: 22) to L. (L.) incisus, and was recovered from the same locality as the holotype.]. Its type specimen is MACN−A1112, a partial skull (Anterior portion of skull with both incisors, complete tooth rows, and right fragment of basicranium), and it is a 3D body fossil. Its type locality is Farola Monte Hermoso, which is in a Montehermosan floodplain siltstone/siltstone in the Monte Hermoso Formation of Argentina.

It was recombined as Viscaccia incisa by Rovereto (1914); it was recombined as Lagostomus (Lagostomopsis) incisus by Rasia and Candela (2013).

Synonyms

Lagostomus intermedius was named by Moreno (1888).

It was synonymized subjectively with Lagostomus incisus by Rasia and Candela (2017).
Lagostomus spicatus was named by Ameghino (1888).

It was recombined as Viscaccia spicata by Rovereto (1914); it was synonymized subjectively with Lagostomus (Lagostomopsis) incisus by Rasia and Candela (2013).

Synonymy list

Year	Name and author
1888	Lagostomus incisus Ameghino p. 9
1888	Lagostomus spicatus Ameghino p. 10
1888	Lagostomus incisus Ameghino p. 54 figs. 3.1–8, 6.1–2
1888	Lagostomus intermedius Moreno p. 15
1914	Viscaccia incisa Rovereto p. 137
1914	Viscaccia spicata Rovereto p. 137
2013	Lagostomus (Lagostomopsis) incisus Rasia and Candela

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes

Rank	Name	Author
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Euarchontoglires	Murphy et al. 2001
—	Gliriformes	Wyss and Meng 1996
—	Glires	()
—	Simplicidentata	()
order	Rodentia	Bowdich 1821
—	Ctenohystrica	Huchon et al. 2000
infraorder	Hystricognathi	(Tullberg 1899)
—	Caviomorpha	(Wood and Patterson 1955)
family	Chinchillidae	Bennett 1833
subfamily	Lagostominae	Wiegmann 1832
genus	Lagostomus	Brookes 1828
subgenus	Lagostomopsis	(Kraglievich 1926)
species	incisus	(Ameghino 1888)

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Lagostomus (Lagostomopsis) incisus Ameghino 1888

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Invalid names: Lagostomus intermedius Moreno 1888 [synonym], Lagostomus spicatus Ameghino 1888 [synonym]

Diagnosis

Reference	Diagnosis
L. L. Rasia and A. M. Candela 2013	Lagostomine 20% smaller than Lagostomus maximus. Maxillae much more expanded transversely, palatines much more reduced in ventral view, and upper cheek teeth more obliquely implanted in the maxillae than in L. (L.) pretrichodactylus, L. (L.) insolitus, L. (L.) angulatus, L. (L.) loberiaensis, L. (L.) euplasius, L. (L.) compressidens, L. (L.) indefinitus, L. cavifrons, and L. maximus. Posterior palatine apophyses of the premaxillae very reduced and not at the same dorsoventral level as the diastema, clearly differing from L. (L.) pretrichodactylus, L. (L.) insolitus, L. (L.) loberiaensis, L. (L.) euplasius, L. (L.) compressidens, L. cavifrons, and L. maximus. Lower cheek teeth much more compressed anteroposteriorly and more obliquely implanted in the mandible than in L. (L.) pallidens, L. (L.) antiquus, L. (L.) insolitus, L. (L.) euplasius, L. (L.) definitus, L. (L.) compressidens, L. debilis, L. hetero− genidens, L. minimus, and L. maximus. Humerus with canalis supracondyloideus (entepicondyloideus) not entirely closed

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilec

Life habit:

ground dwellingf

Diet:

herbivoref

Reproduction:

viviparoussubc

Created:

2005-06-08 10:11:09

Modified:

2005-08-26 13:31:06

Source: f = family, subc = subclass, c = class, subp = subphylum

References: Hendy et al. 2009, Lillegraven 1979, Ji et al. 2002, Nowak 1991, Carroll 1988

Age range: base of the Montehermosan to the top of the Lujanian or 5.00000 to 0.01170 Ma

Collections (10 total)

Time interval	Ma	Country or state	Original ID and collection number
Early/Lower Pliocene	5.333 - 3.6	Argentina (Buenos Aires)	Lagostomus incisus (191766 191769 191770)
Early/Lower Pliocene - Late/Upper Pliocene	5.333 - 2.58	Argentina	Lagostomus incisus (213466)
Pliocene	5.333 - 2.58	Argentina (Buenos Aires)	Lagostomus incisus (140713)
Montehermosan	5.0 - 3.8	Argentina (Buenos Aires)	Lagostomus incisus (198686 198687 198824 type locality: 198863)
Lujanian	0.4 - 0.0117	Argentina (Buenos Aires)	Lagostomus incisus (202096)